參數(shù)資料
型號(hào)： TEA0675T-T
廠(chǎng)商： NXP SEMICONDUCTORS
元件分類(lèi)： 噪聲抑制
英文描述： B Type, DOLBY NOISE REDUCTION IC, PDSO24
封裝： 7.50 MM, PLASTIC, MS-013AD, SOT-137-1, SOP-24
文件頁(yè)數(shù)： 5/32頁(yè)
文件大?。?/td> 225K
代理商： TEA0675T-T
1996 Jun 07
13
Philips Semiconductors
Preliminary specication
Dual Dolby* B-type noise reduction circuit
for playback applications
TEA0675
Description of the principle timing diagram for AMS-latch mode without initial input signal (see Fig.7)
Fig.7 AMS-latch mode without initial input signal.
handbook, full pagewidth
MED627
output signal
to power FET
4.5 V
VAMSEQ
time threshold
upper threshold
(hysteresis)
Vt
VREF
level threshold
Vl
Vin
tr: rise time
td: delay time
tb: burst time
tp: pause time
tf: fall time
Vl: voltage at
level detector
input
pin 3 (CONTRA)
Vt: voltage at
time detector
input
pin 22 (CONTRB)
t
internal
latch status
H
L
t
AMS on
tr
td
tf
tb<tr
tp<td
t0
t3 t4
t5 t6
t7
t8 t9 t10
t11 t12
t13 t14
t15
This is similar to the description of the principle timing
diagram from AMS-scan mode. It only differs in its initial
behaviour and its rise time tr. (Please notice that the
different tr does not occur in the principle timing diagrams
for latch and scan mode).
Running in AMS-latch mode, the circuit may be simply
applied to drive a stop solenoid via a power FET. So the
AMS output signal has not to be processed by a controller.
Because there is no processor to make a decision whether
there is a plop noise or not, for this mode the rise time tr is
extended to approximately 150 ms.
By activating AMS-latch mode the AMS output will not
change to LOW level at t2 if there is no initial signal at Vin.
A latch forces the AMS output to be HIGH until a signal
appears at Vin (t4). After t4 the latch will not affect the
output any more until AMS-latch mode is started again.
The existence of the latch appears necessary if the AMS
output for example drives a stop solenoid via a power FET.
The LOW output level will cause a drive of the stop
solenoid. This would happen after a maximum time of td
occurred without any input signal. If there is no music on
tape for a long time (e.g. at tape end), the AMS mode
would be activated repeatedly as long as there is no signal
at Vin. Thus the circuit waits until first music appears before
detecting the pauses.
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